WORKING WITH ZONES in Visual Studio .NET

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class that provides the zones with common attributes such as their styles and their rectangular appearance within a page. Learning about the common inheritance of zones and the two classifications of zones has been an important step toward truly understanding them. Now let s take a closer look at the common style elements that are provided for all zones by the WebZone class. 5.2.4 Zone appearance Listings 5.1 and 5.2 offered a glimpse at the common styles of zones and how each zone was declared in a similar manner. Because they derive from the WebZone class, all zones share the following common features: The style settings for the zone Zone layout The layout for zones is provided by a set of common rendering methods that exist on the WebZone class, which we ll cover in a short while. For now, however, concentrate on the styles for zones to see what they cover and how we can work with them. Common styles are exposed to zones via a vast set of style properties on the WebZone class. This explains why each of the zones in the earlier listings contained the same named style settings for properties such as PartTitleStyle, HeaderStyle, and FooterStyle. These style properties are responsible for determining how borders are displayed, what colors and fonts are used, and how the headers and footers of zones are presented to users. We can use these style properties to customize the rendered appearance of controls within the zones on our pages. In figure 5.2 we see a CatalogZone with callouts showing various areas and regions within that zone which can be affected by styles.
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Figure 5.2 The style elements can be used to affect the appearance of a wide range of elements within the zone.
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The use of style elements allows us to apply font settings, background and foreground colors, and even images to all the major regions within our zones. Not all the styles called out in figure 5.2 are properties of the base WebZone class. Rather, the WebZone class supplies only the styles that are common to all zones, such as HeaderStyle, FooterStyle, PartStyle and PartChromeStyle. Other style properties specific to a specific zone are added by that zone. For example, the InstructionTextStyle property is added by the CatalogZone, as it is the only zone to supply such text. Listing 5.3 contains the declarative syntax necessary to create the CatalogZone shown in figure 5.2
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Listing 5.3 This CatalogZone contains style elements that are used to control the visual appearance of the zone and its child controls.
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<asp:CatalogZone ID="CatalogZone1" runat="server" Font-Names="Verdana" Padding="10" InstructionText="This is instruction Text" HeaderText="This is header text" BorderColor="lightgray" BorderWidth="1px"> <HeaderVerbStyle ForeColor="White" /> <HeaderStyle BackColor="Black" ForeColor="White" /> <CloseVerb Text="Close Verb" /> <AddVerb Text="Add Verb" /> Style elements provide the <VerbStyle Font-Size="Smaller" /> visual characteristics <PartLinkStyle ForeColor="Blue" /> <SelectedPartLinkStyle ForeColor="Blue" /> <InstructionTextStyle Font-Size="Small" CssClass="instruction-text" /> <LabelStyle BorderColor="Black" BorderWidth="1px" /> <PartChromeStyle BackColor="Control" /> <PartLinkStyle Font-Size=Large /> <PartTitleStyle BackColor="Black" ForeColor="White" /> <FooterStyle BorderStyle="Dashed" />
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<ZoneTemplate> <asp:DeclarativeCatalogPart ID="DeclarativeCatalogPart1" runat="server"> <WebPartsTemplate> <uc2:EmployeeDetails ID="EmployeeDetails2" runat="server" Title="Employee Details" /> <wp:AccountingPart ID="AccountingPart" runat="server" Title="Accounting Web Part" /> </WebPartsTemplate> </asp:DeclarativeCatalogPart> <asp:PageCatalogPart ID="PageCatalogPart1"
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runat="server" /> <asp:ImportCatalogPart ID="ImportCatalogPart1" runat="server" /> </ZoneTemplate> </asp:CatalogZone>
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As we see in this listing, there are many attributes that can be affected by the style. Each of these style elements actually inherits from the base System.Web.UI.WebControls.Style class, which means that each style element allows the user to define fonts, colors, borders, and CSS styles for a particular area within the control s user interface. Having the ability to define a CSS style through the style elements is important because there is much that can be controlled through CSS which cannot be managed by a style. In listing 5.3 the InstructionTextStyle declares a CSS style named instruction-text so that it can control the padding on its left side. This is how the instruction text is made to appear indented in figure 5.2. Although styles provide us with a great deal of flexibility in customizing the rendered output of zones, you sometimes require a finer level of control, such as when you need to add totally new elements within the zone. The next section describes how to deal with this type of situation.
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